package com.atguigu.educenter.controller;

import com.atguigu.educenter.entity.UcenterMember;
import com.atguigu.educenter.service.UcenterMemberService;
import com.atguigu.educenter.utils.ConstantWxUtils;
import com.atguigu.educenter.utils.HttpClientUtils;
import com.atguigu.oss.commonutils.JwtUtils;
import com.atguigu.oss.servicebase.exceptionhandler.GuliException;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;

/**
 * @author luomingliang
 * @date 2020/7/5 23:31
 */
@CrossOrigin
@Controller
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;

    //1 生成微信扫描二维码地址
    @GetMapping("login")
    public String getWxCode() {
        //固定地址, 和面拼接参数
//        String url = "https://open.weixin.qq.com/connect/qrconnect?appid="
//                + ConstantWxUtils.WX_OPEN_APP_ID+"&response_type=";
        // 微信开放平台授权baseUrl %s相当于占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";
        //对redirect_url进行URLEncoder编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "utf-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        //设置%s的值
        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "atguigu"
        );
        //请求微信地址
        return "redirect:"+url;
    }


    //2 获取扫描人信息, 添加数据
    @GetMapping("callback")
    public String callback(String code, String state) {
        try {
            //1 获取code值, 临时票据, 类似于验证码
            //2 拿着code请求微信固定的地址, 得到两个值 access_token 和 openid
//            System.out.println("code = " + code);
//            System.out.println("state = " + state);
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";
            //拼接三个参数: id, 秘钥 和 code值
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code
            );
            //使用httpclient发送请求, 得到返回的结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);
//            System.out.println("accessTokenInfo = " + accessTokenInfo);
            //从accessTokenInfo中取出access_token和openid
            //把accessTokenInfo字符串转换为map集合, 根据map里面key获取对应值
            //使用json转换工具Gson
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token = (String) mapAccessToken.get("access_token");
            String openid = (String) mapAccessToken.get("openid");
//            System.out.println("access_token = " + access_token);
//            System.out.println("openid = " + openid);

            UcenterMember member = memberService.getOpenIdMember(openid);
            if (member == null) { //member时空, 则表中没有相同微信数据, 再进行添加
                //3 拿着得到access_token 和 openid, 再去请求微信提供固定的地址, 获取扫描人信息
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                //拼接两个参数
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid);
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                System.out.println("userInfo = " + userInfo);
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String nickname = (String) userInfoMap.get("nickname"); //昵称
                String headimgurl = (String) userInfoMap.get("headimgurl"); //头像路径

                //把扫描人信息添加数据库中
                //判断数据表里面是否存在相同微信信息, 根据openid判断
                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }
            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());
            //最后: 返回首页面, 通过路径传递token字符串
            return "redirect:http://localhost:3000?token="+jwtToken;
        } catch (Exception e) {
            throw new GuliException(20001, "登录失败");
        }

    }

}
